Adaptation responses in C4 photosynthesis of sweet maize (Zea mays L.) exposed to nicosulfuron

被引:21
|
作者
Wang, Jian [1 ]
Gao, Hui [1 ]
Guo, Zhenqing [1 ]
Meng, Yanyu [1 ]
Yang, Min [1 ]
Li, Xiangling [1 ]
Yang, Qing [1 ]
机构
[1] Hebei Normal Univ Sci & Technol, Coll Agron & Biotechnol, Hebei Key Lab Crop Stress Biol, Qinhuangdao 066000, Hebei, Peoples R China
关键词
Nicosulfuron; Sweet maize; C-4 photosynthetic enzymes; Gene expression; Chloroplast ultrastructure; NADP-MALIC ENZYME; HIGH-LEVEL EXPRESSION; PHOSPHOENOLPYRUVATE CARBOXYLASE; CORN CULTIVARS; GROWTH; TOLERANCE; STRESS; LEAVES; GENE; SALT;
D O I
10.1016/j.ecoenv.2021.112096
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Nicosulfuron is an ingredient in photosynthesis-inhibiting herbicides and has been widely used in corn post-emergence weed control. In the current study, a pair of sister lines, HK301 (nicosulfuron-tolerence, NT) and HK320 (nicosulfuron-sensitive, NS), was used to study the effect of nicosulfuron in sweet maize seedlings on C-4 photosynthetic enzymes and non-enzymatic substances, expression levels of key enzymes, and chloroplast structure. Nicosulfuron was sprayed at the four-leaf stage, and water was sprayed as a control. After nicosulfuron treatment, phosphoenolpyruvate carboxylase (PEPC), NADP-malic dehydrogenase (NADP-MDH), NADP-malic enzyme (NADP-ME), pyruvate orthophosphate dikinase (PPDK), and ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) activities of NT were significantly higher than those of NS. Compared to NT, malate, oxaloacetic acid, and pyruvic acid significantly decreased as exposure time increased in NS. Compared to NS, nicosulfuron treatment significantly increased the expression levels of PEPC, NADP-MDH, NADP-ME, PPDK, and Rubisco genes in NT. Under nicosulfuron treatment, chloroplast ultrastructure of NS, compared to that of NT, nicosulfuron induced swelling of the chloroplast volume and reduced starch granules in NS. In general, our results indicate that in different resistant sweet maize, C-4 photosynthetic enzymes activity and key genes expression play a critical role in enhancing the adaptability of plants to nicosulfuron stress at a photosynthetic physiological level.
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页数:12
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